I am a beginner bread maker and just bought a San Francisco Sourdough starter. The instructions ask to discard part of the starter on day 5 of activating the starter. Why is that?
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I don't have time for a full answer, but note that discard doesn't really mean throw away in this case. "Use up" might be a better term and there are many good recipes for (unfed) starter discard. – Chris H Oct 21 '20 at 17:01
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related : https://cooking.stackexchange.com/q/55179/67 ; https://cooking.stackexchange.com/q/91409/67 ; https://cooking.stackexchange.com/q/75318/67 ; – Joe Oct 21 '20 at 17:29
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3Does this answer your question? [Sourdough starter - Have I been doing it wrong?](https://cooking.stackexchange.com/questions/91409/sourdough-starter-have-i-been-doing-it-wrong) – FuzzyChef Oct 28 '20 at 00:19
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Welcome to SA! Your question about discarding has been asked many times before. Please see the links Joe provided. – FuzzyChef Oct 28 '20 at 00:20
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If some of the starter is not removed, it becomes overly acidic. Too much acid reduces the leavening effect of the starter. Removing and feeding keeps the acid in balance.

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